Just got my clubman back on the road and first thing I did was fill up with petrol. Before and after I got petrol the gauge was working. Second time driving it it wasn't. Checked fuses, earthing, wires, back of gauge...out of ideas. The temp gauge works
Any suggestions?

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71 Clubman 1100

Sender unit

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Do they use the same sender as the MGs? If so, they're very easy to fix, though I seem to remember they aren't all that expensive either.
Could be the float's split and is just hanging at the bottom.

Digging around on the Moss Motors catalogue answered this one. They use a different sender to the MG but they use the same style of sender. Again, easy to get out. Could be the float split and filled with fuel (hence permanent empty) or you broke a wire in the rheostat (assuming it's the sender, it may not be).

(1) Earth out the sender unit wire and the guage should go up, if not then the guage/wirings faulty. If it does go up don't automaticly condem sender unit, check tank earth first then when the fuel gets low, below unit, take it out and check floats not full of fuel or fell off. If that's ok then check tiny wire in unit for breakages.
(2) Does it have power to guage? dud voltage stabiliser?
(3) Clubman dash, check printed circuit.

That was my first thought .

I bet you put something bulky in the boot and ripped one of the wires off the sender

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did I tell you that I won a trophy?